Looks like they might be doing better than preorders through the web site. Mine hasn't shipped yet and I don't think I'll have mine on the 26th unless the ship overnight on Friday.
Interesting configuration, if it had a mSD in the monitor, I'd have seriously considered this one (lots of power for $1700). IMO it's a shame that the current SP4 i5 configurations don't include an 8GB RAM/128GB SSD option. It's weird that all of the i3/i5 128GB SSD options include only 4GB RAM (even more glaring since they're all iGPU).
Replaced the display and upgraded the SSD in a Book 2 15"